Sock



FIG. 1 is a front perspective view showing a sock;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a right elevational view thereof; and,

FIG. 7 is a left elevational view thereof.

The broken lines in the drawings depict portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a sock, as shown and described. 